Control method for forced load drop of steam turbine generator unit

The invention relates to the technical field of thermal power generation, in particular to a control method for forced load drop of a steam turbine generator unit. According to the control method for the forced load drop of the steam turbine generator unit, when any side of the main throttle valve of the steam turbine is suddenly closed, the through-flow capacity is rapidly reduced, and the load in the unit is too large, the automatic control system detects that the main throttle valve on any side is closed and the load in the unit is too large, and an upper-layer coal mill is cut off; and meanwhile, the amount of fed coal water is adjusted through the response action of rapid water and coal reduction, and the load of the unit is reduced to the maximum allowable load of the main throttle valve on the single side. The control system automatically responds to accident handling of closing of a single-side main throttle valve of the turboset, the risk that manual discovering is not timely or improperly handled is